<template>
  <div>
    <!-- Header 区域 -->
    <van-nav-bar
      fixed
      title="文章详情"
      left-arrow
      @click-left="$router.back()"
    />
    <!-- 可修改文案和加载图标的颜色 -->
    <van-loading class="loading-article" color="#0094ff" vertical v-if="artObj.title === undefined">文章加载ing...</van-loading>

    <!-- 文章详情 -->
    <div v-else>
      <!-- 文章信息区域 -->
      <div class="article-container">
        <!-- 文章标题 -->
        <h1 class="art-title">{{ artObj.title }}</h1>

        <!-- 用户信息 -->
        <van-cell
          center
          :title="artObj.aut_name"
          :label="formatDate(artObj.pubdate)"
        >
          <template #icon>
            <img :src="artObj.aut_photo" alt="" class="avatar" />
          </template>
          <template #default>
            <div>
              <van-button
                type="info"
                size="mini"
                v-if="artObj.is_followed === true"
                @click="unFollowedFn"
                >已关注</van-button
              >
              <van-button
                icon="plus"
                type="info"
                size="mini"
                plain
                v-else
                @click="followedFn"
                >关注</van-button
              >
            </div>
          </template>
        </van-cell>

        <!-- 分割线 -->
        <van-divider></van-divider>

        <!-- 文章内容 -->
        <div class="art-content" v-highlight v-html="artObj.content"></div>

        <!-- 分割线 -->
        <van-divider>End</van-divider>

        <!-- 点赞 -->
        <div class="like-box">
          <van-button
            icon="good-job"
            type="danger"
            size="small"
            v-if="artObj.attitude === 1"
            @click="likeFn(true)"
            >已点赞</van-button
          >
          <van-button
            icon="good-job-o"
            type="danger"
            plain
            size="small"
            v-else
            @click="likeFn(false)"
            >点赞</van-button
          >
        </div>
      </div>

      <!-- 文章评论区域 -->
      <comment-list :artId="$route.query.aid"></comment-list>
    </div>
  </div>
</template>

<script>
import {
  getArticleDetailAPI,
  followedAuthorAPI,
  unFollowedAuthorAPI,
  unLikeArticleAPI,
  likeArticleAPI
} from '@/api'

import dayjs from 'dayjs'
import 'dayjs/locale/zh-cn' // import locale
import * as relativeTime from 'dayjs/plugin/relativeTime' // use locale
import CommentList from './CommentList.vue'

dayjs.extend(relativeTime)
dayjs.locale('zh-cn')

// 目标: 图片防盗链
// 1. 我们在用img标签, 请求第三方服务器的图片地址时, 第三方服务器做了判断来源, 就可能会返回403状态码 (图片请求的响应状态码)
// 尝试解决:
// index.html上, 加meta: no-referrer
// 本次请求不再携带Referrer在请求头, 表明自己的来源, 尝试让后台的判断代码失效
// 后台可能还用了别的判断, 所以这种方式不一定能100%成功
export default {
  name: 'Article',
  components: { CommentList },
  data () {
    return {
      artObj: {} // 文章数据对象
    }
  },
  methods: {
    // 格式化多久之前
    formatDate (dateStr) {
      var a = dayjs()
      var b = dayjs(dateStr)
      const c = a.to(b) // 2 years ago
      return c
    },
    // 关注按钮 -> 点击事件
    async followedFn () {
      // 关注
      await followedAuthorAPI(this.artObj.aut_id)
      // 已关注按钮出现
      this.artObj.is_followed = true
    },
    // 已关注按钮 -> 点击事件
    async unFollowedFn () {
      // 关注按钮出现
      // 取关
      await unFollowedAuthorAPI(this.artObj.aut_id)
      this.artObj.is_followed = false
    },
    // 点赞 / 已点赞 -> 按钮 -> 点击事件
    async likeFn (bool) {
      if (bool === true) {
        // 用户点 "已点赞" 按钮
        // 业务 -> 取消点赞文章
        await unLikeArticleAPI(this.$route.query.aid)
        // 显示 -> 点赞按钮
        this.artObj.attitude = 0
      } else {
        // 用户点 "点赞" 按钮
        // 业务 -> 点赞某篇文章
        await likeArticleAPI(this.$route.query.aid)
        // 显示 -> 已点赞按钮
        this.artObj.attitude = 1
      }
    }
  },
  async created () {
    const res = await getArticleDetailAPI({
      artId: this.$route.query.aid
    })
    console.log(res)
    this.artObj = res.data.data
  }
}
</script>

<style scoped lang="less">
.loading-article{
 margin-top: 46px;
}

.article-container {
  padding: 10px;
  margin-top: 46px;
}
.art-title {
  font-size: 16px;
  font-weight: bold;
  margin: 10px 0;
}

.art-content {
  font-size: 12px;
  line-height: 24px;
  width: 100%;
  overflow-x: scroll;
  word-break: break-all;
  /deep/ img {
    width: 100%;
  }
  /deep/ pre {
    white-space: pre-wrap;
    word-wrap: break-word;
  }
}

.van-cell {
  padding: 5px 0;
  &::after {
    display: none;
  }
}

.avatar {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background-color: #f8f8f8;
  margin-right: 5px;
  border: none;
}

.like-box {
  display: flex;
  justify-content: center;
}
</style>
